Answered
When K=dlqr(Ad,Bd,Q,R) is used, Ad,Bd is already discretized, why not Q,R?
According to dlqr, the Q and R matrices input to the function define the discrete-time quadratic cost function sum. In that sens...

1 year ago | 0

Answered
how to convert signal to physical signal in matlab
Mabye PS-Simulink Converter and/or Simulink-PS Converter is what you're looking for.

1 year ago | 0

Answered
Coordinate Transformation in Rotational System Equations (Spacecraft Dynamics Block)
Hi Gökhan, Why do you think that the equation is written in inertial (i.e. ICRF) frame. It looks to me like that equation is th...

1 year ago | 0

Answered
solving a nonlinear equation with complex numbers
Does this solution work? syms R syms X Zo = sym(50); Z=(R*1i*X/(R+1i*X)); r=(Z-Zo)/(Z+Zo); assume(R,'positive') assume(...

2 years ago | 1

Answered
Fourier Transform of e^jkt, not giving an answer
Need to specify that K is real. Also, if only using two arguments to fourier the second argument is the transform variable, so s...

2 years ago | 0

Answered
Second argument must be a scalar or vector of unique symbolic variables.
No error if running here w/2024b, nor did I get an error running on my local machine with 2024a syms X; syms gamma; syms Y; ...

2 years ago | 0

Answered
FFT result dependent on number of interpolation points
Hi Ali, The doc page for interpft states: "interpft(x,n) interpolates the Fourier transform of the function values in X to pro...

2 years ago | 0

Answered
How to get the datatype from the signal line to excel after compiling the model?
Hi jenny, Signal names on the outputs of a block can be found via: names = get_param(block,'OutputSignalNames'); The port (in...

2 years ago | 0

Answered
Finding the sample time of a Simulink signal/line programmatically with Simulink.Block.getSampleTimes
Hi Andrew, If the block has multiple outputs, like in your case, check out ts.ComponentSampleTimes which should be an array o...

2 years ago | 0

Answered
Not getting desired signal when I multiply sine wave and pulse generator in Simulink
Hi Deepankar, If the question shows the full model, then we can see it has no continuous states. The solver will be VariableSte...

2 years ago | 0

Answered
Plotting DTFT in Matlab
L = 1000; fg = 1000; fs = 100000; T = 1/fs; tmin = 0; K = 1; n = tmin:L; t = n*T; %Base function calculation x = xdp1(K...

2 years ago | 0

Answered
Accessing struct variable data inside MATLAB function block in Simulink
Hi Jacob, The typical way to define a parameter in a Matlab Function block is described at Use Data in Multiple MATLAB Function...

2 years ago | 0

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Answered
Unable to get sym(pi) to output Pi in matlab
Check your sympref sympref Make sure that FloatingPointOutput is set to False.

2 years ago | 2

Answered
Symbolic Piecewise Addition Issue
Seems to work here. How does the singz function work insofar as the output argument, func, is not defined inside the function. ...

2 years ago | 0

Answered
Given the spectrum of a signal x(t) , What is the minimum sample rate that would allow for x[n] to be recoverable?
Hi Zhen, Your question isn't really about Matlab. You might get more traction on a signal processing forum, like dsp.stackexcha...

2 years ago | 0

Answered
Explore DFT Resolution, need help with answer interpretation
Hi Zhen, The first code gives the expected result, you just need to zoom in to see it. If we look at how freq_axis is defined,...

2 years ago | 0

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Answered
Explore DFT frequency accuracy, got stuck
Hi Zhen, Consider the following, which is one case from the overall analysis. %Part 1 % MATLAB code to analyze the frequency ...

2 years ago | 0

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Answered
How do I name a variable in Simulink so that I can later use it to compute a value, such as sin(psi) or cos(phi) or tan(theta).
Hi DJ, I did not open your model so I'm not sure exactly what you're trying to do. Having said that, Simulink doesn't really c...

2 years ago | 0

Answered
Why is my hamming window and rectangular window values the same for sigma_omega when I make L = 21?
Another approach is to integrate the DTFT directly. The DTFT can be evaluted with freqz % Set window length L = 21 L = 21; % ...

2 years ago | 0

Answered
generating periodic trapezoidal waves with ramps
Approach using pulstran trap = @(t) interp1([0 1 2 3 4 5],[0 0 1 1 0 0],t,[],0); t = 0:.01:25; d = 0:5:25; plot(t,pulstran(t...

2 years ago | 0

Answered
Can I save the outputs of completed sims when running parsim instead of saving them all at the end?
Hi Kadhir, Based on the description in the question, I'm not quite sure what's happening. How exactly are you monitoring the me...

2 years ago | 0

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Answered
Plot Fourier Transform (FFT) Interpolation Model into future
I've only very briefly skimmed this code and the other thread. My guess is that you're seeing the effect of zero-padding the FFT...

2 years ago | 0

Answered
Adding plots to an existing root locus plot
Maybe sgrid is what you're looking for.

2 years ago | 0

Answered
Calculation not having the desired array size
Was % xn(1:3,:) = qF(:,:,i) .* Acc(i,:)' - g; should be xn(1:3,:) = (qF(:,:,i) * Acc(i,:).' - g.').';

2 years ago | 0

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Answered
How to properly make a circular histogram?
Hi Neuroesc, "However, the resulting histogram is not really ideal - the bins are not homogeneous because they get larger as th...

2 years ago | 1

Answered
Trying to use for loop to create an array of bandpass filters, but gets error "conversion to double from dfilt.df2sos is not possible"
Hi Hanlin Wang, fs = 48000; % sample frequency wss1 = [5680 2840 1420 710 355 177 88 44]*2*pi/fs; wss2 = [11360 5680 2840 142...

2 years ago | 0

Answered
Compare char data in a cell {'x'} to a character 'x'
Create the sample .txt file filetext = ["HEADER that is ignored";"R 0 5";"L 5 0"]; writelines(filetext,"test.txt"); type test...

2 years ago | 0

Question

Why Doesn't "clear all" Clear the Assumptions from the Symbolic Engine?
According to the doc page assumptions To clear all objects in the MATLAB workspace and close the Symbolic Math Toolbox™ engine ...

2 years ago | 1 answer | 0

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answer

Answered
Finding Z-Transform of a piecewise function.
Based on the context of the question, it is quite likely that the problem is to solve for the bilateral z-transform of f(n). Ho...

2 years ago | 0

Answered
Generate random integers that sums to a specific number within a specific range
How about a simple loop that finds all combinations of the random variables that satisfy the constraint and then sample from tha...

2 years ago | 0